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Kinetic Particle Theory - Chemical Changes - Decomposition

A newspaper-style prezi on chemical decomposition
by

Loo Zen Yee

on 17 September 2013

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Transcript of Kinetic Particle Theory - Chemical Changes - Decomposition

Kinetic Particle Theory - Chemical changes - Decomposition
What is chemical decomposition?
It is:
the
separation
of a chemical compound into 2 or more elements/simpler compounds
(i.e. reactant → 2 or more products)
Often an
undesired
chemical reaction
the
opposite
of a
synthesis reaction

(i.e. 2 or more reactants→product)
How to obtain the chemical equation
1. Write the formula for the
reactant

(e.g. NaCl, everyone's favourite compound)
2. Break down the reactant into
stable compounds/elements
and write them down
(e.g. NaCl → Na + Cl2)
*take note of the elements that exist as diatomic molecules
3. Balance the equation
(e.g. 2 NaCl → 2 Na + Cl2)
Note that...
This method
does not work for all equations
.
A
metal hydrogen carbonate
reactant will decompose into
metal carbonate, carbon dioxide and water
.

e.g. sodium hydrogen carbonate →sodium carbonate + carbon dioxide + water
2 NaHCO3 → Na2CO3 + CO2 + H2O
Why does decomposition occur?
The
stability
a chemical compound
ordinarily has is
limited
when
exposed to
extreme environmental
conditions

(e.g. heat, radiation,
humidity or the acidity of a
solvent)
.

Catalytic Decomposition
faster
breaking down of a chemical compound into
ions
by using a
catalyst
Types of Decomposition
Thermal
Catalytic
Electrolytic
Catalytic decomposition of hydrogen peroxide
The Daily Paper
Electrolytic Decomposition
breaking down of a chemical compound into
ions
by
passing electricity
through a
solution
Electrolysis/electrolytic decomposition of water
Thermal Decomposition
breaking down of a chemical compound by
heating
Thermal decomposition of Copper(II) carbonate
References:

Picture:
http://www.chemistryland.com/CHM130W/08-Equations/ --TypesReactionsQuiz/TypesReactionsQuiz.htm
Videos:
Electrolytic - youtube/sciencefix
Thermal - youtube/NCSSMDistanceEd
Catalytic - youtube/Brian Swarthout
Information:
youtube/Papapodcasts
http://en.wikipedia.org/wiki/Chemical_decomposition
Full transcript